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One way of working around that could be to also schedule the setpoints - set the cooling setpoint higher when it's not supposed to be being used, and the heating setpoint lower when it's not supposed to be being used.

edit: using Dual Setpoint you should be able to do this like so:

ThermostatSetpoint:DualSetpoint,
    setpoints1,              !- Name
    Heating,                 !- Heating Setpoint Temperature Schedule Name
    Cooling;                 !- Cooling Setpoint Temperature Schedule Name

Schedule:Compact,
Heating,
,
Through: 03/31,
For: AllDays,
Until: 24:00, 22.78,
Through: 10/20,
For: AllDays,
Until: 24:00, 20,
Through: 12/31,
For: AllDays,
Until: 24:00, 22.78;

Schedule:Compact,
Cooling,
,
Through: 06/30,
For: AllDays,
Until: 24:00, 25,
Through: 09/15,
For:AllDays,
Until: 24:00, 22.22,
Through: 12/31,
For: AllDays,
Until: 24:00, 25;

Fill in setpoint values as desired. You could try to set it up to swap between single heating and single cooling, but I think that would be more complicated and not really add anything? Unless someone who knows more about the fine details of the systems says otherwise...